Update jackson (#61)

Author: adhesivee

oauth2-server-integration-base/pom.xml

@@ -11,6 +11,10 @@
 
     <artifactId>oauth2-server-integration-base</artifactId>
 
+    <properties>
+        <jackson.version>2.9.9</jackson.version>
+    </properties>
+
     <dependencies>
         <dependency>
             <groupId>com.squareup.okhttp3</groupId>
@@ -51,17 +55,17 @@
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-core</artifactId>
-            <version>2.9.8</version>
+            <version>${jackson.version}</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
-            <version>2.9.8</version>
+            <version>${jackson.version}</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.module</groupId>
             <artifactId>jackson-module-kotlin</artifactId>
-            <version>2.9.8</version>
+            <version>${jackson.version}</version>
         </dependency>
         <dependency>
             <groupId>org.hamcrest</groupId>